DIVE Biology Quarterly Exam 4 Practice Test & Study Guide

The correct choice, which is passive immunity, refers to the type of immunity that is acquired through the transfer of antibodies from another organism. This transfer can occur naturally, such as when a mother passes antibodies to her infant through breast milk, or artificially, through medical interventions like antibody injections.

Passive immunity provides immediate protection since the antibodies are pre-formed, but it is temporary because the recipient's immune system does not produce the antibodies over time. This is in contrast to active immunity, where the body produces its own antibodies in response to an infection or vaccination, leading to long-lasting protection. Natural immunity pertains to immunity acquired through infection, while innate immunity is the non-specific first line of defense present in an organism from birth. Therefore, the distinctive aspect of passive immunity lies in its reliance on external sources for antibodies.